The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | -2 |
| 2 | 24 |
| 3 | -664 |
| 4 | 28416 |
| 5 | -942336 |
| 6 | -260697984 |
| 7 | 165900454656 |
| 8 | -85943912448000 |
| 9 | 48584004553543680 |
| 10 | -31574321393019125760 |
| 11 | 23832746038658540666880 |
| 12 | -20858343927838973179822080 |
| 13 | 21048655959583804491297914880 |
[1,-2,24,-664,28416,-942336,-260697984, 165900454656,-85943912448000,48584004553543680, -31574321393019125760,23832746038658540666880, -20858343927838973179822080, 21048655959583804491297914880] |